Plastic composition and process of making same



Patent ed Nov. 4,

UNITED STATES Exammer PATENT OFFICE.

ARDON M. MITCHELL, OF CRESTWOOD, NEW YORK, ASSIGNOR OF ONE-HALF TO KATEM. WIDMER AND ONE-HALF TO HARRIET I. BAIN, BOTH OF NEW YORK, N. Y.

PLASTIC COMPOSITION AND PROCESS OF MAKING SAME.

No Drawing. Application filed July 9,

To all whom it may concern Be it known that I, ARDON M. MITCHELL,citizen of the United States, residing at Crestwood, in the county of\Vestchester and State of New York, hax e invented ceradaptable for pipecoverings, blocks, plaster boards, insulation, and the like.

A further object resides in initiating a reaction which may continuethrough and subsequent to the molding of the roduct without exuding aportion of the binder element ressure. p y

falfen from the mold and placed on end to to the surface.

Another object is to provide a composition and a method of mixing thesame whereupon the ingredients may be uickly 25 molded into the productand then ecome more intimately united and bound together throughinternal reaction after removal from the mold. The invention furtherresides in the features, steps and their combinations and arrangementsas will be hereinafter described in detail and succinctly claimed.

In proceeding in accordance with the present invention, I take sixparts\of%l ashes and dampen the same with one, ar

of water. To the dampenedashesis a ded one part of finely dividedcaustic soda and the whole thoroughly mixe e s is then immediately lacemold under The uc can imme dry. The subsequent diffusion of the alkalithroughout the mass enormously increases the reaction andcrystallization without the subsequent breaking up of the crystalloidalformation that would take place in a fluid content. The heat evolved inthe reaction between the water and thesoda is cqnsegved to react on thecolloids of the ashes more 1923. Serial No. 650,513.

effectively because of the concentration. The large crystalloids areunbroken and in consequence give greater strength to the product, and inthe drying the efiiorescence and exudations to the surface of the moldedform from the center prevent an unequal distribution of the binder.

The heat and the reaction act instantly on the colloids in the ashes tomake binder enough to maintain the form so that it can be taken from themold and handled at once. The molded form taken from the mold continuesto react until the reagent is satisfied.

The mass is firmly held intact by the binder. The caustic soda whichforms the binder is of sufficient viscosity to hold the molded bodyintact while the continued reaction serves to harden the body withoutpermitting the reagent to exosmose to the surface.

This method produces a very strong and light product which is admirablyadapted for the manufacture of building blocks, plgterflgouds, and pipecoverings, witliinsulating qualities equaltotho'se of asbestos. Theproduct can also be utilized in various other capacities, as forrendering all cellulose (such as grass straw, hemp, and paper)non-inflammable.

Time and labor is the essence of the improved method for where it is notdesired to utilize a liquid binder, aggregates insoluble in water mayexpeditiously be united into one solid body. This method is applicablewhere a fluid binder is not desired to bind other aggregates and hasalso the advantage of not exuding a portion of the binder to the surfaceleaving an uneven distribution. The element of time saved is adesideratum by reason of there being less water to dry out and does notinvolve the use of tanks for boiling or digesting or concentrating thebinder to adapt it to bind other aggregates.

What is claimed is:

1. The method which consists in dampening six parts of coal ash with onepart of water, t oroughly mixing with the dampened ashes one part offinely divided caustic produced in dampening six parts of coal soda, andthen molding the mass under presash with one part of water, thoroughlysure. mixing with the dampened ashes one part 10 2. A composition ofmatter composed of of finely divided caustic soda, and then 5 six partsof coal ashes, one part of Water, molding the mass under pressure.

and one part of caustic soda. In testimony whereof I aflix my signature.3. A heat insulating material which is ARDON M. MITCHELL.

